He who is present at a wrongdoing and does not lift a hand to prevent it, is as guilty as the wrongdoers. – American Indian Proverb

Total physical and mental inertia are highly agreeable, much more so than we allow ourselves to imagine. A beach not only permits such inertia but enforces it, thus neatly eliminating all problems of guilt. It is now the only place in our overly active world that does. – John Kenneth Galbraith

The guilty think all talk is of themselves. – Chaucer

Punishment closely follows guilt as its companion. – Horace